HP Print Service Plugin is an official app from HP (although it works on Android devices from any manufacturer) that allows you to send any document from your Android to a printer connected to the same network. For this to work, obviously, the printer has to be from the HP inkjet or LaserJet series.
This application is fully compatible with the following devices: Android 4.4 (KitKat), Samsung Galaxy Note 3, S4, HP Slate 7, HP Slate 8 Pro, HP Slate 10, HP Slate 21, and HP SlateBook.
HP Print Service Plugin is a very useful app for anyone who has one of the printers mentioned above since it will allow you to print documents right from the comfort of your Android.